CN114042904B

CN114042904B - Method for improving ladle self-opening rate

Info

Publication number: CN114042904B
Application number: CN202111453094.4A
Authority: CN
Inventors: 刘建伟; 王学新; 苗振鲁; 李国柱; 孙金明; 郑九刚; 刘同堂; 王建波; 薛燕
Original assignee: SD Steel Rizhao Co Ltd
Current assignee: SD Steel Rizhao Co Ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2023-01-24
Anticipated expiration: 2041-12-01
Also published as: CN114042904A

Abstract

The invention discloses a method for improving the self-opening rate of a steel ladle, which comprises the following steps: after cold steel in a steel ladle upper nozzle is cleaned in a hot repair process, a drainage sand storage cylinder is arranged in the steel ladle upper nozzle, the first end of the drainage sand storage cylinder faces inwards, the second end of the drainage sand storage cylinder faces outwards, the outer diameter of the drainage sand storage cylinder is 2-4 mm smaller than the inner diameter of the steel ladle upper nozzle, the height of the drainage sand storage cylinder is 50-100 mm longer than the height of the steel ladle upper nozzle, the first end of the drainage sand storage cylinder is sealed, and the second end of the drainage sand storage cylinder is not sealed; after the drainage sand storage cylinder is placed into a ladle upper nozzle, by utilizing the inclination angle of a ladle, wherein the upper nozzle is low in inside and high in outside, the drainage sand is poured into the drainage sand storage cylinder through a sand pouring flow pipe, and then the sliding plate is closed; the storage cylinder for the drainage sand is 50-100 mm longer than the height of the water feeding port of the ladle, and one end of the storage cylinder is sealed, so that the effective height of the drainage sand in the water feeding port of the ladle after the ladle is filled with steel is ensured, the top of the drainage sand is prevented from being lower than the bottom of the ladle, and the molten steel is prevented from being retained and solidified in the water feeding port.

Description

Method for improving ladle self-opening rate

Technical Field

The invention belongs to the technical field of positioning of a step pad, and particularly relates to a method for improving the self-opening rate of a steel ladle.

Background

In recent years, with the continuous diversification of product demands in the steel market, the requirements on the product quality are higher and higher, and the ladle opening rate reflects the product control level of a steel enterprise to a certain extent.

In the current production process, when a ladle is not opened, the long nozzle needs to be taken off, oxygen is manually used for oxygen burning and drainage operation of drainage sand in the ladle nozzle, and although molten steel can come off, oxidation of the molten steel by the oxygen, secondary oxidation of the molten steel in the open casting part in contact with air, impact of steel flow in the open casting process on a middle ladle slag layer and the like all have great tendency to deteriorate the quality of the molten steel. On-site statistics shows that the probability of the rising of the stopper rod stroke in the pouring process is up to 90 percent when the steel ladle is not opened by self and is drained to the molten steel before secondary casing hanging by oxygen burning, particularly low-carbon high-aluminum steel is more obvious, the rising of the stopper rod stroke macroscopically shows that the molten steel inclusion is increased, the quality of the molten steel is deteriorated, and the method is contrary to the quality control concept of the current steel enterprises.

The automatic casting device disclosed in the current chinese patent No. CN91231503.2 can realize the above automatic casting, but it has the following disadvantages:

1. after the pouring device is directly arranged in a water gap, molten steel easily permeates into the sliding plate from a gap between the filling cylinder and the inner wall of the upper water gap, so that steel bonding or steel leakage accidents of the sliding plate are caused.

2. The pouring device is internally filled with filler, and can generate a thermal expansion phenomenon under the high-temperature action of steel contained in a steel ladle, so that the internal filler is compressed to form a shed or expands outwards to break a charging barrel.

3. The pouring device is provided with an upper seal and a lower seal, the lower seal is opened along with the opening of the sliding plate, the opening of the sliding plate cannot generate opening power for the lower seal, and the actual operation of the operation site is difficult to realize; the upper seal is broken by the hydrostatic pressure of molten steel and opened, so that the link is not ideal in actual operation, and the upper seal can be a condition that a steel ladle cannot be opened by itself greatly.

The automatic ladle pouring plug disclosed by the existing Chinese patent No. CN200620043235.X can realize the automatic pouring, but the defects are as follows:

1. the core part of the open-cast plug is made of refractory material containing steel fiber, and the open-cast plug is compressed or expanded downwards under the action of hydrostatic pressure and high temperature of molten steel, so that a larger friction force is generated between the open-cast plug and a ladle drain port after being extruded, and the ladle slide plate is not easy to fall off after being opened.

2. The pouring plug body is made of steel fiber containing materials, only one hole with the diameter of a central hole smaller than the diameter of drainage sand particles is reserved, if cold steel in the reusable sleeve is not cleaned, the pouring plug blocks a steel flow channel after falling down, and steel vomit accidents can occur at a steel erection neck where the sleeve is connected with a steel ladle drainage port under the action of hydrostatic pressure.

Disclosure of Invention

The invention aims to provide a method for improving the self-opening rate of a ladle.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for improving the ladle self-opening rate comprises the following steps:

1) After cold steel in a steel ladle upper nozzle is cleaned in a hot repair process, a drainage sand storage cylinder is arranged in the steel ladle upper nozzle, the first end of the drainage sand storage cylinder faces inwards, the second end of the drainage sand storage cylinder faces outwards, the outer diameter of the drainage sand storage cylinder is 2-4 mm smaller than the inner diameter of the steel ladle upper nozzle, the height of the drainage sand storage cylinder is 50-100 mm longer than the height of the steel ladle upper nozzle, the first end of the drainage sand storage cylinder is sealed, and the second end of the drainage sand storage cylinder is not sealed;

2) After the drainage sand storage cylinder is placed into a ladle upper nozzle, the drainage sand is poured into the drainage sand storage cylinder through a sand pouring flow pipe by utilizing the inclination angle of the ladle, wherein the inner part of the upper nozzle is low and the outer part of the upper nozzle is high, and then the sliding plate is closed.

The invention has the following beneficial effects: the drainage sand storage cylinder is 50-100 mm longer than the height of a water feeding port of a steel ladle, and one end of the storage cylinder is sealed, so that the effective height of the drainage sand in the water feeding port of the steel ladle after the steel is contained in the steel ladle is ensured, the top of the drainage sand is prevented from being lower than the bottom of the steel ladle, and the molten steel is prevented from being retained and solidified in the water feeding port.

Drawings

FIG. 1 is a schematic diagram of a sand filling process of the drainage sand storage barrel.

FIG. 2 is a schematic structural diagram of the drainage sand storage barrel after sand filling.

In the figure: 1-water feeding port; 2-a drainage sand storage cylinder; 3-filling a sand flow pipe; 4-drainage sand.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-2, a method for improving ladle self-opening rate includes the following steps:

1) Manufacturing a drainage sand storage barrel 2, wherein the drainage sand storage barrel 2 is made of a thin steel plate or an iron sheet, the thickness of the steel plate or the iron sheet is 1-3 mm, the outer diameter of the drainage sand storage barrel 2 is 2-4 mm smaller than the inner diameter of a ladle upper nozzle 1, the height of the drainage sand storage barrel 2 is 50-100 mm longer than the height of the ladle upper nozzle 1, the first end of the drainage sand storage barrel 2 is sealed, and the second end of the drainage sand storage barrel 2 is not sealed;

2) After cold steel in the upper nozzle of the ladle is cleaned in the hot repair process, the storage cylinder 2 for the drainage sand is arranged in the upper nozzle 1 of the ladle, one end of the seal faces inwards, and the other end of the seal faces outwards;

3) After the storage cylinder 2 for the drainage sand is placed into the upper water opening 1 of the ladle, the drainage sand is poured into the storage cylinder 2 for the drainage sand through the sand pouring flow pipe 3 by utilizing the inclination angle (the inner part of the upper water opening is low and the outer part of the upper water opening) of the ladle, and then the sliding plate is closed.

The storage cylinder 2 of the drainage sand is 50-100 mm longer than the height of the upper nozzle 1 of the steel ladle, and one end of the storage cylinder is sealed, so that the effective height of the drainage sand in the upper nozzle of the steel ladle after the steel ladle is filled is ensured (see figure 2), the top of the drainage sand is prevented from being lower than the bottom of the steel ladle, and the retention and solidification of molten steel in the upper nozzle are avoided.

The higher part of the drainage sand storage cylinder 2 is impacted by molten steel in the tapping process and can be melted, and a molten steel circulation channel in the drainage sand drainage process can not be blocked.

The drainage sand storage barrel 2 is made of a steel plate or an iron sheet with the thickness of 2-5 mm, so that the drainage sand storage barrel is melted after being contacted with molten steel, and the occurrence of steel vomit accidents can be avoided.

The outer diameter of the drainage sand storage cylinder 2 is 2-4 mm smaller than the inner diameter of the ladle upper nozzle 1, on one hand, the drainage sand storage cylinder is convenient to install into the ladle upper nozzle 1, on the other hand, the cylinder wall is quickly melted even if molten steel enters a gap, and drainage sand is quickly filled, so that the sliding plate is effectively prevented from penetrating into the gap between the drainage sand storage cylinder 2 and the inner wall of the ladle upper nozzle 1, and the steel bonding or steel leakage accidents of the sliding plate are avoided.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims

1. A method for improving the ladle self-opening rate is characterized by comprising the following steps:

1) After cold steel in a ladle water feeding port is cleaned up in a hot repair process, a drainage sand storage cylinder is arranged in the ladle water feeding port, the first end of the drainage sand storage cylinder faces inwards, the second end of the drainage sand storage cylinder faces outwards, the outer diameter of the drainage sand storage cylinder is 2-4 mm smaller than the inner diameter of the ladle water feeding port, the height of the drainage sand storage cylinder is 50-100 mm longer than the height of the ladle water feeding port, the first end of the drainage sand storage cylinder is sealed, and the second end of the drainage sand storage cylinder is not sealed;

2) After the drainage sand storage cylinder is placed into a ladle upper nozzle, by utilizing the inclination angle of a ladle, wherein the inner part of the upper nozzle is low and the outer part of the upper nozzle is high, the drainage sand is poured into the drainage sand storage cylinder through a sand pouring flow pipe, and then the sliding plate is closed.